Add isPausedWorker command to Runtime and use it to auto attach DevTools to ServiceWorker.

BUG=358657

Review URL: https://codereview.chromium.org/299803003

git-svn-id: svn://svn.chromium.org/blink/trunk@174735 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Intent to Ship: CSS Shapes Module Level 1

As discussed on blink-dev.

https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/N6_zzKAjLW4

BUG=249140

Review URL: https://codereview.chromium.org/295053002

git-svn-id: svn://svn.chromium.org/blink/trunk@174736 bbb929c8-8fbe-4397-9dbb-9b2b20218538